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        <a href="../.." >进度事件</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;">&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;</h1>
<h2 id="&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;&#x7684;&#x79CD;&#x7C7B;">&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;&#x7684;&#x79CD;&#x7C7B;</h2>
<p>&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;&#x7528;&#x6765;&#x63CF;&#x8FF0;&#x8D44;&#x6E90;&#x52A0;&#x8F7D;&#x7684;&#x8FDB;&#x5EA6;&#xFF0C;&#x4E3B;&#x8981;&#x7531; AJAX &#x8BF7;&#x6C42;&#x3001;<code>&lt;img&gt;</code>&#x3001;<code>&lt;audio&gt;</code>&#x3001;<code>&lt;video&gt;</code>&#x3001;<code>&lt;style&gt;</code>&#x3001;<code>&lt;link&gt;</code>&#x7B49;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x7684;&#x52A0;&#x8F7D;&#x89E6;&#x53D1;&#xFF0C;&#x7EE7;&#x627F;&#x4E86;<code>ProgressEvent</code>&#x63A5;&#x53E3;&#x3002;&#x5B83;&#x4E3B;&#x8981;&#x5305;&#x542B;&#x4EE5;&#x4E0B;&#x51E0;&#x79CD;&#x4E8B;&#x4EF6;&#x3002;</p>
<ul>
<li><code>abort</code>&#xFF1A;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x4E2D;&#x6B62;&#x52A0;&#x8F7D;&#x65F6;&#xFF08;&#x6BD4;&#x5982;&#x7528;&#x6237;&#x53D6;&#x6D88;&#xFF09;&#x89E6;&#x53D1;&#x3002;&#x5982;&#x679C;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#x5BFC;&#x81F4;&#x4E2D;&#x6B62;&#xFF0C;&#x4E0D;&#x4F1A;&#x89E6;&#x53D1;&#x8BE5;&#x4E8B;&#x4EF6;&#x3002;</li>
<li><code>error</code>&#xFF1A;&#x7531;&#x4E8E;&#x9519;&#x8BEF;&#x5BFC;&#x81F4;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x65E0;&#x6CD5;&#x52A0;&#x8F7D;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
<li><code>load</code>&#xFF1A;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x52A0;&#x8F7D;&#x6210;&#x529F;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
<li><code>loadstart</code>&#xFF1A;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x5F00;&#x59CB;&#x52A0;&#x8F7D;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
<li><code>loadend</code>&#xFF1A;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x505C;&#x6B62;&#x52A0;&#x8F7D;&#x65F6;&#x89E6;&#x53D1;&#xFF0C;&#x53D1;&#x751F;&#x987A;&#x5E8F;&#x6392;&#x5728;<code>error</code>&#x3001;<code>abort</code>&#x3001;<code>load</code>&#x7B49;&#x4E8B;&#x4EF6;&#x7684;&#x540E;&#x9762;&#x3002;</li>
<li><code>progress</code>&#xFF1A;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x52A0;&#x8F7D;&#x8FC7;&#x7A0B;&#x4E2D;&#x4E0D;&#x65AD;&#x89E6;&#x53D1;&#x3002;</li>
<li><code>timeout</code>&#xFF1A;&#x52A0;&#x8F7D;&#x8D85;&#x65F6;&#x65F6;&#x89E6;&#x53D1;&#x3002;</li>
</ul>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x9664;&#x4E86;&#x8D44;&#x6E90;&#x4E0B;&#x8F7D;&#xFF0C;&#x6587;&#x4EF6;&#x4E0A;&#x4F20;&#x4E5F;&#x5B58;&#x5728;&#x8FD9;&#x4E9B;&#x4E8B;&#x4EF6;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript">image.addEventListener(<span class="hljs-string">&apos;load&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  image.classList.add(<span class="hljs-string">&apos;finished&apos;</span>);
});

image.addEventListener(<span class="hljs-string">&apos;error&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  image.style.display = <span class="hljs-string">&apos;none&apos;</span>;
});
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5728;&#x56FE;&#x7247;&#x5143;&#x7D20;&#x52A0;&#x8F7D;&#x5B8C;&#x6210;&#x540E;&#xFF0C;&#x4E3A;&#x56FE;&#x7247;&#x5143;&#x7D20;&#x6DFB;&#x52A0;&#x4E00;&#x4E2A;<code>finished</code>&#x7684; Class&#x3002;&#x5982;&#x679C;&#x52A0;&#x8F7D;&#x5931;&#x8D25;&#xFF0C;&#x5C31;&#x628A;&#x56FE;&#x7247;&#x5143;&#x7D20;&#x7684;&#x6837;&#x5F0F;&#x8BBE;&#x7F6E;&#x4E3A;&#x4E0D;&#x663E;&#x793A;&#x3002;</p>
<p>&#x6709;&#x65F6;&#x5019;&#xFF0C;&#x56FE;&#x7247;&#x52A0;&#x8F7D;&#x4F1A;&#x5728;&#x811A;&#x672C;&#x8FD0;&#x884C;&#x4E4B;&#x524D;&#x5C31;&#x5B8C;&#x6210;&#xFF0C;&#x5C24;&#x5176;&#x662F;&#x5F53;&#x811A;&#x672C;&#x653E;&#x7F6E;&#x5728;&#x7F51;&#x9875;&#x5E95;&#x90E8;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x56E0;&#x6B64;&#x6709;&#x53EF;&#x80FD;<code>load</code>&#x548C;<code>error</code>&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x6839;&#x672C;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x6BD4;&#x8F83;&#x53EF;&#x9760;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x662F;&#x7528;<code>complete</code>&#x5C5E;&#x6027;&#x5148;&#x5224;&#x65AD;&#x4E00;&#x4E0B;&#x662F;&#x5426;&#x52A0;&#x8F7D;&#x5B8C;&#x6210;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">loaded</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-comment">// ...</span>
}

<span class="hljs-keyword">if</span> (image.complete) {
  loaded();
} <span class="hljs-keyword">else</span> {
  image.addEventListener(<span class="hljs-string">&apos;load&apos;</span>, loaded);
}
</code></pre>
<p>&#x7531;&#x4E8E; DOM &#x7684;&#x5143;&#x7D20;&#x8282;&#x70B9;&#x6CA1;&#x6709;&#x63D0;&#x4F9B;&#x662F;&#x5426;&#x52A0;&#x8F7D;&#x9519;&#x8BEF;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x6240;&#x4EE5;<code>error</code>&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x6700;&#x597D;&#x653E;&#x5728;<code>&lt;img&gt;</code>&#x5143;&#x7D20;&#x7684; HTML &#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x8FD9;&#x6837;&#x624D;&#x80FD;&#x4FDD;&#x8BC1;&#x53D1;&#x751F;&#x52A0;&#x8F7D;&#x9519;&#x8BEF;&#x65F6;&#x767E;&#x5206;&#x4E4B;&#x767E;&#x4F1A;&#x6267;&#x884C;&#x3002;</p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-name">img</span> <span class="hljs-attr">src</span>=<span class="hljs-string">&quot;/wrong/url&quot;</span> <span class="hljs-attr">onerror</span>=<span class="hljs-string">&quot;this.style.display=&apos;none&apos;;&quot;</span> /&gt;</span>
</code></pre>
<p><code>loadend</code>&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x53D6;&#x4EE3;<code>abort</code>&#x4E8B;&#x4EF6;&#x3001;<code>load</code>&#x4E8B;&#x4EF6;&#x3001;<code>error</code>&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x603B;&#x662F;&#x5728;&#x8FD9;&#x4E9B;&#x4E8B;&#x4EF6;&#x4E4B;&#x540E;&#x53D1;&#x751F;&#x3002;</p>
<pre><code class="lang-javascript">req.addEventListener(<span class="hljs-string">&apos;loadend&apos;</span>, loadEnd, <span class="hljs-literal">false</span>);

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">loadEnd</span>(<span class="hljs-params">e</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x4F20;&#x8F93;&#x7ED3;&#x675F;&#xFF0C;&#x6210;&#x529F;&#x5931;&#x8D25;&#x672A;&#x77E5;&apos;</span>);
}
</code></pre>
<p><code>loadend</code>&#x4E8B;&#x4EF6;&#x672C;&#x8EAB;&#x4E0D;&#x63D0;&#x4F9B;&#x5173;&#x4E8E;&#x8FDB;&#x5EA6;&#x7ED3;&#x675F;&#x7684;&#x539F;&#x56E0;&#xFF0C;&#x4F46;&#x53EF;&#x4EE5;&#x7528;&#x5B83;&#x6765;&#x505A;&#x6240;&#x6709;&#x52A0;&#x8F7D;&#x7ED3;&#x675F;&#x573A;&#x666F;&#x90FD;&#x9700;&#x8981;&#x505A;&#x7684;&#x4E00;&#x4E9B;&#x64CD;&#x4F5C;&#x3002;</p>
<p>&#x53E6;&#x5916;&#xFF0C;<code>error</code>&#x4E8B;&#x4EF6;&#x6709;&#x4E00;&#x4E2A;&#x7279;&#x6B8A;&#x7684;&#x6027;&#x8D28;&#xFF0C;&#x5C31;&#x662F;&#x4E0D;&#x4F1A;&#x5192;&#x6CE1;&#x3002;&#x6240;&#x4EE5;&#xFF0C;&#x5B50;&#x5143;&#x7D20;&#x7684;<code>error</code>&#x4E8B;&#x4EF6;&#xFF0C;&#x4E0D;&#x4F1A;&#x89E6;&#x53D1;&#x7236;&#x5143;&#x7D20;&#x7684;<code>error</code>&#x4E8B;&#x4EF6;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;</p>
<h2 id="progressevent-&#x63A5;&#x53E3;">ProgressEvent &#x63A5;&#x53E3;</h2>
<p><code>ProgressEvent</code>&#x63A5;&#x53E3;&#x4E3B;&#x8981;&#x7528;&#x6765;&#x63CF;&#x8FF0;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x52A0;&#x8F7D;&#x7684;&#x8FDB;&#x5EA6;&#xFF0C;&#x6BD4;&#x5982; AJAX &#x52A0;&#x8F7D;&#x3001;<code>&lt;img&gt;</code>&#x3001;<code>&lt;video&gt;</code>&#x3001;<code>&lt;style&gt;</code>&#x3001;<code>&lt;link&gt;</code>&#x7B49;&#x5916;&#x90E8;&#x8D44;&#x6E90;&#x52A0;&#x8F7D;&#x3002;&#x8FDB;&#x5EA6;&#x76F8;&#x5173;&#x7684;&#x4E8B;&#x4EF6;&#x90FD;&#x7EE7;&#x627F;&#x4E86;&#x8FD9;&#x4E2A;&#x63A5;&#x53E3;&#x3002;</p>
<p>&#x6D4F;&#x89C8;&#x5668;&#x539F;&#x751F;&#x63D0;&#x4F9B;&#x4E86;<code>ProgressEvent()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x6765;&#x751F;&#x6210;&#x4E8B;&#x4EF6;&#x5B9E;&#x4F8B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">new</span> ProgressEvent(type, options)
</code></pre>
<p><code>ProgressEvent()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#x3002;&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x8868;&#x793A;&#x4E8B;&#x4EF6;&#x7684;&#x7C7B;&#x578B;&#xFF0C;&#x8FD9;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x5FC5;&#x987B;&#x7684;&#x3002;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#xFF0C;&#x8868;&#x793A;&#x4E8B;&#x4EF6;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x8BE5;&#x53C2;&#x6570;&#x53EF;&#x9009;&#x3002;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#x9664;&#x4E86;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>Event</code>&#x63A5;&#x53E3;&#x7684;&#x914D;&#x7F6E;&#x5C5E;&#x6027;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x4E0B;&#x9762;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x6240;&#x6709;&#x8FD9;&#x4E9B;&#x5C5E;&#x6027;&#x90FD;&#x662F;&#x53EF;&#x9009;&#x7684;&#x3002;</p>
<ul>
<li><code>lengthComputable</code>&#xFF1A;&#x5E03;&#x5C14;&#x503C;&#xFF0C;&#x8868;&#x793A;&#x52A0;&#x8F7D;&#x7684;&#x603B;&#x91CF;&#x662F;&#x5426;&#x53EF;&#x4EE5;&#x8BA1;&#x7B97;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F;<code>false</code>&#x3002;</li>
<li><code>loaded</code>&#xFF1A;&#x6574;&#x6570;&#xFF0C;&#x8868;&#x793A;&#x5DF2;&#x7ECF;&#x52A0;&#x8F7D;&#x7684;&#x91CF;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F;<code>0</code>&#x3002;</li>
<li><code>total</code>&#xFF1A;&#x6574;&#x6570;&#xFF0C;&#x8868;&#x793A;&#x9700;&#x8981;&#x52A0;&#x8F7D;&#x7684;&#x603B;&#x91CF;&#xFF0C;&#x9ED8;&#x8BA4;&#x662F;<code>0</code>&#x3002;</li>
</ul>
<p><code>ProgressEvent</code>&#x5177;&#x6709;&#x5BF9;&#x5E94;&#x7684;&#x5B9E;&#x4F8B;&#x5C5E;&#x6027;&#x3002;</p>
<ul>
<li><code>ProgressEvent.lengthComputable</code></li>
<li><code>ProgressEvent.loaded</code></li>
<li><code>ProgressEvent.total</code></li>
</ul>
<p>&#x5982;&#x679C;<code>ProgressEvent.lengthComputable</code>&#x4E3A;<code>false</code>&#xFF0C;<code>ProgressEvent.total</code>&#x5B9E;&#x9645;&#x4E0A;&#x662F;&#x6CA1;&#x6709;&#x610F;&#x4E49;&#x7684;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> p = <span class="hljs-keyword">new</span> ProgressEvent(<span class="hljs-string">&apos;load&apos;</span>, {
  lengthComputable: <span class="hljs-literal">true</span>,
  loaded: <span class="hljs-number">30</span>,
  total: <span class="hljs-number">100</span>,
});

<span class="hljs-built_in">document</span>.body.addEventListener(<span class="hljs-string">&apos;load&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x5DF2;&#x7ECF;&#x52A0;&#x8F7D;&#xFF1A;&apos;</span> + (e.loaded / e.total) * <span class="hljs-number">100</span> + <span class="hljs-string">&apos;%&apos;</span>);
});

<span class="hljs-built_in">document</span>.body.dispatchEvent(p);
<span class="hljs-comment">// &#x5DF2;&#x7ECF;&#x52A0;&#x8F7D;&#xFF1A;30%</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5148;&#x6784;&#x9020;&#x4E00;&#x4E2A;<code>load</code>&#x4E8B;&#x4EF6;&#xFF0C;&#x629B;&#x51FA;&#x540E;&#x88AB;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x6355;&#x6349;&#x5230;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x5B9E;&#x9645;&#x7684;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> xhr = <span class="hljs-keyword">new</span> XMLHttpRequest();

xhr.addEventListener(<span class="hljs-string">&apos;progress&apos;</span>, updateProgress, <span class="hljs-literal">false</span>);
xhr.addEventListener(<span class="hljs-string">&apos;load&apos;</span>, transferComplete, <span class="hljs-literal">false</span>);
xhr.addEventListener(<span class="hljs-string">&apos;error&apos;</span>, transferFailed, <span class="hljs-literal">false</span>);
xhr.addEventListener(<span class="hljs-string">&apos;abort&apos;</span>, transferCanceled, <span class="hljs-literal">false</span>);

xhr.open();

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">updateProgress</span>(<span class="hljs-params">e</span>) </span>{
  <span class="hljs-keyword">if</span> (e.lengthComputable) {
    <span class="hljs-keyword">var</span> percentComplete = e.loaded / e.total;
  } <span class="hljs-keyword">else</span> {
    <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x4E0D;&#x80FD;&#x8BA1;&#x7B97;&#x8FDB;&#x5EA6;&apos;</span>);
  }
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">transferComplete</span>(<span class="hljs-params">e</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x4F20;&#x8F93;&#x7ED3;&#x675F;&apos;</span>);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">transferFailed</span>(<span class="hljs-params">evt</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x4F20;&#x8F93;&#x8FC7;&#x7A0B;&#x4E2D;&#x53D1;&#x751F;&#x9519;&#x8BEF;&apos;</span>);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">transferCanceled</span>(<span class="hljs-params">evt</span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x7528;&#x6237;&#x53D6;&#x6D88;&#x4E86;&#x4F20;&#x8F93;&apos;</span>);
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x662F;&#x4E0B;&#x8F7D;&#x8FC7;&#x7A0B;&#x7684;&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;&#xFF0C;&#x8FD8;&#x5B58;&#x5728;&#x4E0A;&#x4F20;&#x8FC7;&#x7A0B;&#x7684;&#x8FDB;&#x5EA6;&#x4E8B;&#x4EF6;&#x3002;&#x8FD9;&#x65F6;&#x6240;&#x6709;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x90FD;&#x8981;&#x653E;&#x5728;<code>XMLHttpRequest.upload</code>&#x5BF9;&#x8C61;&#x4E0A;&#x9762;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> xhr = <span class="hljs-keyword">new</span> XMLHttpRequest();

xhr.upload.addEventListener(<span class="hljs-string">&apos;progress&apos;</span>, updateProgress, <span class="hljs-literal">false</span>);
xhr.upload.addEventListener(<span class="hljs-string">&apos;load&apos;</span>, transferComplete, <span class="hljs-literal">false</span>);
xhr.upload.addEventListener(<span class="hljs-string">&apos;error&apos;</span>, transferFailed, <span class="hljs-literal">false</span>);
xhr.upload.addEventListener(<span class="hljs-string">&apos;abort&apos;</span>, transferCanceled, <span class="hljs-literal">false</span>);

xhr.open();
</code></pre>




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